Here is the grand experiment we are going to try when we finally get to calm down from the Flex5000 rush to finish. I have done enough matlab/octave experimentation to expect it to work so long as we define what it is we mean by work.
Suppose you are listening to weak signal A. Strong signal B comes on and its main power is well out of your passband but the splatter or sidebands are in your passband and harms your ability to hear signal A. The mathematical idea is that the portion of the signal B that is in your passband is correlated with the "main" signal that is out of your passband. It is strongly correlated and we should be able to derive a "filter" that will predict a version of the signal that is IN your passband. The property of the signal we will optimize on is to reduce the energy of the interference to the best of our ability. If we get 20 dB reduction of the inband interference from an "out of band" interferer, I will consider it a victory. Much more than that and I will consider it to be a major league success. Bob Ray Andrews wrote: > Guy, > > Of course, a notch filter could be coded to work anywhere in the range of > the panadapter display. However, don't hold your breath waiting for it to > do what you want. If the splatter is caused by an improperly adjusted > transmitter somewhere else on the band, then the splatter consists of > spurious signals that are within your desired pass band. Notching out the > main signal will NOT reduce the spurious signals -- they have already been > put there by the dirty transmitter. > > The only way that this type of notch filter would help is if the splatter is > caused by overload in your receiver, either in the hardware or in the signal > processing software. > > Sorry, > > 73, Ray, K9DUR > > > _______________________________________________ > FlexRadio mailing list > FlexRadio@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > FlexRadio Knowledge Base: http://kb.flex-radio.com/ > FlexRadio Homepage: http://www.flex-radio.com/ > > -- Robert W. McGwier, Ph.D. Center for Communications Research 805 Bunn Drive Princeton, NJ 08540 (609)-924-4600 (sig required by employer) _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
